Abstract: A method for manufacturing a battery pack includes forming a positive electrode plate; forming a negative electrode plate; forming an electrode body; forming a battery cell; applying a binding load to battery cells; and initially charging the battery cells. When “A mg/cm2” represents a mass of a positive electrode active material on the positive electrode substrate, “C cm3/cm2” represents a volume of pores in the positive electrode substrate, “B mg/cm2” represents a mass of a negative electrode active material on the negative electrode substrate, “D cm3/cm2” represents a volume of pores in the negative electrode substrate, “E cm3/cm2” represents a volume of pores in the separator, and “F N/mm2” represents pressure applied to an opposing portion of a case of the electrode body facing a flat surface of the electrode body, a value of (A+B)/{(C+D+E)/F} is between 1300 and 3000, inclusive.

Abstract: The nonaqueous electrolyte secondary battery herein disclosed includes a nonaqueous electrolyte, a wound electrode assembly, and a battery case accommodating them. The wound electrode assembly includes a pair of flat surface parts and a pair of R parts. In a state where 4.5 kN restriction pressure is added from a thickness direction so as to restrict the wound electrode assembly, when a total of outermost circumferential lengths of the pair of R parts of the wound electrode assembly on a cross section orthogonal to the winding axis of the wound electrode assembly is treated as a (mm), an outermost circumferential length of the cross section is treated as b (mm), a width of the positive electrode active material layer is treated as c (mm), and a height of the wound electrode assembly of the cross section is treated as d (mm), both 0.282<a/b and c/d<1.91 are satisfied.

Abstract: A lithium-ion battery includes a positive electrode, which includes positive electrode mixture material containing positive electrode active material particles and conductive material, a negative electrode, which includes a negative electrode mixture material, and an electrolyte. The positive electrode active material particles include primary particles, a first particle aggregate of the primary particles cohered into a mass with a hollow portion having a diameter of less than 1 ?m, and a second particle aggregate of the primary particles cohered into a mass with a hollow portion having a diameter of 1 ?m or greater. When referring to the primary particles and the first particle aggregate as first particles, the first particles occupy 5% to 70% of the positive electrode active material particles. The positive electrode mixture material has a void percentage of 20% to 60%. The conductive material has an aspect ratio of 1:10 or greater.

Abstract: A non-aqueous electrolytic secondary battery includes a rolled electrode assembly including a positive electrode, a negative electrode and a separator, the positive electrode and the negative electrode being rolled with the separator sandwiched between the positive and negative electrodes; a non-aqueous electrolytic solution; and a quadrangular battery case accommodating the rolled electrode assembly and the non-aqueous electrolytic solution. The positive electrode includes a positive electrode active material layer containing at least a positive electrode active material and carbon nanotubes as a conductive material. The negative electrode includes a negative electrode active material layer containing a negative electrode active material. Where a void volume per unit area of the negative electrode active material layer is A (cm3/cm2) and a void volume per unit area of the positive electrode active material layer is B (cm3/cm2), the non-aqueous electrolytic secondary battery satisfies 0.6?B/A?1.2.

Abstract: A lithium-ion battery includes a roll formed by rolling a stack of a negative electrode plate, separator, and positive electrode plate in a rolling direction into a flattened form. A negative electrode collector portion formed at one roll end where the negative electrode mixture layer is not applied to two opposite surfaces of the negative electrode substrate layer has an undulated form. The negative electrode substrate layer has two opposite surfaces that are less the negative electrode mixture layer at the end of the roll. A positive electrode collector portion formed at the other roll end where the positive electrode mixture layer is not applied to two opposite surfaces of the positive electrode substrate layer has an undulated form. The positive electrode substrate layer has two opposite surfaces that are less the positive electrode mixture layer at the other roll end.

Abstract: A battery stack includes cells that are arranged in a row and bound together. Each of the cells includes a case and an electrode body accommodated in the case. The cells include multiple types of position variation cells, in which positions of electrode bodies of the cells are different from each other when the cells are viewed in an arrangement direction of the cells.

Abstract: A lithium-ion rechargeable battery includes an electrode body rolled about a roll axis to be low-profile. In a cross section orthogonal to the roll axis, the electrode body includes a planar flat portion pressed to have a low profile and two semicircular rod-shaped bent portions bent and formed on opposite ends of the flat portion. Combined resistance of reaction resistance caused by an inter-electrode distance with solution resistance caused by air permeance of the separator in site, longitudinally extending from center to a peripheral surface of each bent portion, equals combined resistance of the reaction resistance with the solution resistance in site, extending from straight line to a peripheral surface of the flat portion in a thickness-wise direction, to obtain uniform resistance of the electrode body, thereby limiting deposition of lithium metal caused by non-uniform current density.

Abstract: A nonaqueous electrolyte rechargeable battery includes an electrode body, a nonaqueous electrolyte, and a rectangular box-shaped battery case accommodating the electrode body and the nonaqueous electrolyte. The electrode body includes a positive electrode including a positive base and a positive composite material layer, a negative electrode including a negative base and a negative composite material layer, and a porous resin separator disposed therebetween. The electrode body has a low profile when the positive electrode, the negative electrode, and the separator are laminated and rolled. When spring constant of the nonaqueous electrolyte rechargeable battery with a load of 316 to 210 N/cm2 and 95 to 74 N/cm2 is respectively referred to as spring constant H and spring constant L, the ratio L/H is 0.34 or greater and 0.41 or less. A resistance increase rate between before and after a square wave test is less than or equal to 1.17.

Abstract: A secondary battery with a reduced degree of increase in internal pressure over time, is provided. In a preferred embodiment, a secondary battery including: an electrode body, a battery case, an electrode terminal, and a gasket sandwiched between the battery case and the electrode terminal is provided. The secondary battery is configured such ghat a parameter K calculated using the following equation (1): K=Wi/(VrGH2) (1) (where Wi represents an initial capacity (Ah) of the secondary battery, Yr represents a volume (cm3) of void in the battery case, and GH2, represents an H2 gas permeability coefficient (cm3·cm)/(cm2·s·cmHg) of the gasket at 60° C.) satisfies 0.43×108 or more to 0.59×108 or less.